Looks like I need to actually read my Kflop/Kanalog documentation again. It's been a few years since I have looked at it. I have only installed one on a customer machine, and that was a few years ago.
I have found that the analog motor command signal to be very reliable. I have had very good luck with magnetic scales on the table, had them on my machines for a few years now. And the real advantage is the backlash (within reason) and any lead screw error is automatically compensated. I have no encoders on the leadscrew or motors.